-- Set up nvim-cmp.
local cmp = require'cmp'

cmp.setup({
    snippet = {
	expand = function(args)
	   vim.fn["UltiSnips#Anon"](args.body)
	end,
   },
    mapping = cmp.mapping.preset.insert({
	['<C-k>'] = cmp.mapping.select_prev_item(),
	['<C-j>'] = cmp.mapping.select_next_item(), 
	['<C-b>'] = cmp.mapping.scroll_docs(-4),
	['<C-f>'] = cmp.mapping.scroll_docs(4),
	['<C-Space>'] = cmp.mapping.complete(),
	['<C-e>'] = cmp.mapping.abort(),
	['<tab>'] = cmp.mapping.confirm({ select = true }),
   }),
   sources = cmp.config.sources({
     { name = 'nvim_lsp' },
      { name = 'ultisnips' },
   }, {
     { name = 'buffer' },
   })
 })


-- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline({ '/', '?' }, {
  mapping = cmp.mapping.preset.cmdline(),
  sources = {
    { name = 'buffer' }
  }
})

-- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline(':', {
  mapping = cmp.mapping.preset.cmdline(),
  sources = cmp.config.sources({
    { name = 'path' }
  }, {
    { name = 'cmdline' }
  }),
  matching = { disallow_symbol_nonprefix_matching = false }
})


-- Set up lspconfig.
local capabilities = require('cmp_nvim_lsp').default_capabilities()
local lsp = require('lspconfig')

lsp.ccls.setup{
    capabilities = capabilities,
    init_options = {
        cache = {
            directory = vim.fn.expand("~/.cache/ccls")  -- Store index globally
        },
        compilationDatabaseDirectory = "build",  -- Uses 'build/compile_commands.json' if present
        highlight = { lsRanges = true },  -- Improves semantic highlighting
        index = {
            threads = 4,  -- Adjust based on your CPU (more threads = faster indexing)
            initialBlacklist = { ".*_test.cpp", ".*_unittest.cpp" }  -- Avoid indexing test files
        },
        completion = {
            detailedLabel = true  -- Better completion info
        },
        diagnostics = {
            onChange = 300  -- Delay diagnostics updates for better performance
        }
    }
}


-- clangd and ccls are both C and C++ language servers
-- having them both active at the same time is useless
-- lsp.clangd.setup {
--     capabilities = capabilities,
-- }